package net.wendal.nutzbook.shiro.freemarker;

import java.io.IOException;
import java.util.Map;

import org.nutz.log.Log;
import org.nutz.log.Logs;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateException;

/**
 * JSP tag that renders the tag body if the current user <em>is not</em> known
 * to the system, either because they haven't logged in yet, or because they
 * have no 'RememberMe' identity.
 * 
 * <p>
 * The logically opposite tag of this one is the {@link UserTag}. Please read
 * that class's JavaDoc as it explains more about the differences between
 * Authenticated/Unauthenticated and User/Guest semantic differences.
 * 
 * <p>
 * Equivalent to {@link org.apache.shiro.web.tags.GuestTag}
 * </p>
 * 
 * @since 0.9
 */
public class GuestTag extends SecureTag {
	private static final Log log = Logs.get();

	@SuppressWarnings("rawtypes")
	@Override
	public void render(Environment env, Map params, TemplateDirectiveBody body) throws IOException, TemplateException {
		if (getSubject() == null || getSubject().getPrincipal() == null) {
			if (log.isDebugEnabled()) {
				log.debug("Subject does not exist or does not have a known identity (aka 'principal').  Tag body will be evaluated.");
			}

			renderBody(env, body);
		} else {
			if (log.isDebugEnabled()) {
				log.debug("Subject exists or has a known identity (aka 'principal').  Tag body will not be evaluated.");
			}
		}
	}
}
